TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0015 00 0015 00-5 HEATING SYSTEMS TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. ENGINE MANIFOLD HEATER DOES NOT WORK (Contd) Test 7. Test fuel pump-to-ignition coil wiring harness. 1. Disconnect wiring harness input to ignition coil. 2. Set multimeter to 24 VDC scale. 3. Turn power accessory switch to the ON position and touch multimeter negative lead to pin B (negative) of wiring harness at ignition coil. 4. Touch multimeter positive lead to pin A (positive) of wiring harness at ignition coil. 1. If voltage is present, go to test 9. 2. If voltage is not present, go to test 8. Table 1. Heating Systems Troubleshooting Procedures (Contd). FUEL PUMP IGNITION COIL PIN A IGNITION COIL WIRING HARNESS PIN B TEST 7 STEP 4